Toward Ferroelectric Control of Monolayer MoS<sub>2</sub>
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Abstract
The
chemical vapor deposition (CVD) of molybdenum disulfide (MoS<sub>2</sub>) single-layer films onto periodically poled lithium niobate is possible
while maintaining the substrate polarization pattern. The MoS<sub>2</sub> growth exhibits a preference for the ferroelectric domains
polarized “up” with respect to the surface so that the
MoS<sub>2</sub> film may be templated by the substrate ferroelectric
polarization pattern without the need for further lithography. MoS<sub>2</sub> monolayers preserve the surface polarization of the “up”
domains, while slightly quenching the surface polarization on the
“down” domains as revealed by piezoresponse force microscopy.
Electrical transport measurements suggest changes in the dominant
carrier for CVD MoS<sub>2</sub> under application of an external voltage,
depending on the domain orientation of the ferroelectric substrate.
Such sensitivity to ferroelectric substrate polarization opens the
possibility for ferroelectric nonvolatile gating of transition metal
dichalcogenides in scalable devices fabricated free of exfoliation
and transfer